Estimate Roof Size From Floor Plan

Anything more than 9 in 12 is considered steep.

Estimate roof size from floor plan.

The next thing to determine is the roof pitch see how to determine roof pitch the easiest and most accurate method to measuring a roof plan is to square everything off. In this drawing a 1 8 scale ruler is being used. The roof below is drawn in 1 8 scale this means that if using a regular tape measure that 1 inch would equal 8 feet. Conventional slope roof range between 4 in 12 and 8 in 12.

A low slope roof is anywhere from 2 in 12 to 4 in 12. Now based on the info provided your home s floor plan is roughly 1 000 sq ft. A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof. So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having.

The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. Multiply by the square footage of a single floor of your house. These benefits do not come cheaply though. From the diagrams there are two intersecting roofs measuring 114 feet and 30 feet at the eaves with equal rake of 18 feet.

While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12.